The four-times African Footballer of the Year wrote: "The doctors confirm! I would probably not be able to play the match vs Croatia... due to an injury on my knee causing me pain."

The doctors confirm! I would probably not be able to play the match vs Croatia on Wed, june18th due to an injury on my knee causing me pain.

- Samuel Eto'o (@setoo9) June 15, 2014Chelsea striker Eto'o has been struggling with a knee problem since the end of the Premier League season.

He told Cameroon state television on Sunday: "During the match [a 1-0 defeat] against Mexico I tried -- but after consulting the medical staff we realised that I needed a rest. Even in the ninth minute, I felt pain.

"For three-and-a-half months, I have not had the time to recover. You could see that even in the buildup to the World Cup I hadn't had a lot of practice until the friendly against Germany."